What was found
ORD - FL 904 - AFTER TAKEOFF AND ON GEAR RETRACTION, CREW RECEIVED THREE RED LIGHTS. GEAR WAS CYCLED, CREW RECEIVED GREEN INDICATIONS FOR THE MAINS BUT A RED FOR THE NOSE GEAR. FLIGHT RETURNED TO ORD AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE ACCOMPLISHED A STRUT SERVICING PER THE MAINTENANCE MANUAL. (M)